Method of making endless wire fabrics



Nov. l2, 1929. R. FR'ANCK 4 METHOD op MAKING -ENDLEss WIRE FABRIcs FiledD90. 30. 1927 A. an, @Af

. Patented Nov.v 12, 1929 PATENT OFFICE REN FRANCK, F SELESTAT, FRANCEMETHOD or MAKING ENnLEss WIRE FABRIcs Application filedI December 30,1927,l Serial No. 243,778, and in France January 6, 1927.

My invention consists in a novel method for joining by means of a directand asvclose as possible junction the two ends of a wire cloth for thepurpose of rendering said cloth circular, or, as the term goes, ,endlessThe improvements contemplated by my novel method are numerous, one ofthe objects being to do away with all the drawbacks involved by seamsand, broadly, by all the junction systems hitherto in use for renderingwire cloth endless.' Said drawbacks, very awkward in paper, cardboard,and such like manufacturing, can be summed up as follows: 1. More orless marked opaqueness of the seamed'junction portion.l When, in view ofgreater strength, the sewing and joining wires were made thick, theholes of the meshes of the wire cloth got obturated by the big size ofsaid sewing and joining wires. If, per contra, their thickness wasreduced in view of decreasing the opaqueness of the junction there wouldresult a decrease of the resistance of the seam and junction wires tofrictional wear and tearing by traction.

for direct joining hitherto used, the soldered or brazed junction bandstill comprised a completely opaque width which was rather too great forproper dropping of the wet pa er or cardboard sheet, due to thenecessity of llin with solder all the interstices, sinuosities andrecesses involved in entwining through j uxtaposing or throughsuperimposing the cloth ends, and owing to the overflowing and burrslresulting from such a filling up as the iux of the fusion metal couldnot always be sufficiently contained and leaded Without intero ruptionon account of the resistance it`en7 countered when making its waythrough the 40 meanders, sinuosities and the hollows, re-

cesses or empty spaces which it should ill up regularly. Said filling,vresulting from the soldering or brazingjunction was therefore effectedunder considerable diiculties and did not always give the expectedresult.

. My new method does away with all the above inconveniences whilepermitting great regularity and the width of the opaque band to bereduced according to requirements.

My invention is ,illustrated in the accomspecial weft wires in place,

2. With the soldering or brazing meansl panying drawings wherein Figure1 shows a cross-section of the wire fabric provided with special endweft-wires, before completion of the junction; Figure 2 shows thecompleted .junction of the wire fabric after 55. fusion of the softmetal of which m special end weft-wires are composed; and igures 3 and 4show a lmodification of the type of special weft wires employed inmaking the junction.

Referring to Figure 1 it will be seen that the ends c and d of the wirefabric are providedeachwithaspecialweftwire. Thisweft wire is composedof two coaxial and concentric wires a and b, the first of which, ineffect, forms a core for the other. Wire core a is j made of anon-fusible metal, while the outer wire b is made of a softer and morefusible metal.

In Figure 1 the ends c and d of the wire 70 fabric are placed injuxtaposition with the that is, woven between the end warp-wires. Heatis then applied to these ends of the fabric causing the soft wire I ateach end to fuse and, in flowing, 75 to form the junction shown inFigure 2. Thus the fused metal rigidly joins the warp wires at the endsc and d as well as the non-fusible wires a which become imbedded in thefused metal.

In Figure 3, instead ofA using coaxial end weft-wires,two wires areplaced side by side throughout the width of the fabric, the nonfusiblewires a being in adjacent position, while the fusible wires b" are onthe outside of the wires a. In this instance, it will; be noted, bothsets of wires a, and b are solid.

Figure l3 shows the` ends of the wire fabric ,in juxtaposition with theweft wires a and b in place. After the application of heat causing thefusion of wires b', the junction shown in Figure 4 is obtained. i

In this case the fusing metal also joins solidly the ends Vof the warpwires as well as the non-fusible weft wires a.

My method, therefore, consists mainly in the fact that the ends yof thewarp wires or wires of the cloth ends are cut off or shortened so thatsaid ends, on being juxtaposed or superpsed, will form a real sort ofchannel- 100 lization or conduit quite straight and thereand the endweft-wires of higher fusing fore' will easily be infiltrated by thefusioned point.

metal on account of the adhesion and capil- In testlmony whereof I aiiixmy slgnature. larity effects brought into play, said effects v "g beingobtainable and usable in any direction, v REN FRANCK. o

' either lateral or lengthwise or else heightwise for superposedcontacts. In the latter case, the increased thickness resulting fromsuperposition can besuppressed or reduced by com- '10 pression, byhammering, or by any other ade- 75 quate means.

My method .furthermore consists, in view of facilitating and of limitingthe abovementioned effects, in the insertion into the 1I woven body atthe two ends intended to be f 80 joined, of special weft wires to beconsidered as wires for channellization or leading and for adduction ofsoldering or brazing metal.

Thesewires may, for instance, consist of a v 42l) core of non-fusiblemetal coated with a fus- 85 ible metal, or else of a combination of twowires, which will be inserted jointly, the one made of non-fusible metaland acting as a conduit or leading the second wire made of 2l fusiblemetal, during its fusion. The fusible 90 metal used may be of any kind,provided it will melt at a temperature lower than the melting point ofthe metals which the cloth is made of. The two above indicated effects lmay be combined or appropriated in a suit- 95 alblehmanner according tothe Iineness of the c ot The whole of said effects, very d iicult tocombine, to appropriate and to handle, conil stitutes the realization ofa highly important I 100 I improvement of great practical value in themanufacturing of paper, or cardboard, and of all such like products.

Having now particularly ascertained and described the nature of my saidinvention 105 -as well as the manner in which the same is'to beperformed, I declare that what I claim is:

1. In the method of forming Fourdrinier mesh, the steps of providing endweft wires l l 45 of part fusible and part non-fusible metal, 110

weaving them into the ends of the fabric to be joined, bringing the endsof the fabric together, and then applying heat to cause the vfusiblemetal to join the parts together.

2, In the method of forming Fourdrinier f 115 mesh, the steps ofproviding end weft wires, one of fusible and one of non-fusible4 metal,weaving them side by side into the ends of the fabric to be joined,bringing the ends of the fabric together, and then applying heat 12 tocause the fusible metal to join the parts to- A gether.

3. In making a seamless joint for wire cloth, the process of providingmetallic end e0 weft-wires having different fusing points, A 12 Ainserting. them' side by side between the end warp-wlres, bringing theends of the fabric together, and then applying heat to cause themetallic end weft-wires of lower fusing e5 point to join together theend warp-wires 130

